Currently I have .22lr match and 35 rem (pictured) in pistol and .223 and 45 cal muzzleloading in rifle.I have the 44 mag in rifle on order and use to have .223 and 45colt/.410 in pistol. I traded them off for the .223 rifle barrel.

In past years, I've owned 2 ea. Contenders with 5 different barrels. All the barrels were 10" standard tapered. The calibers were 22 rim-fire (don't remember if it was LR. or mag.), a 222 Rem., a 30-30, a 357 mag. and a 44 mag. Actually, in the late '70s, I harvested a Buck in Pa. with the 30-30 barrel.
Like a dummy, I let them go. If I find another one in the right caliber and at the right price, it may come home with me??